GPT-5.1 vs GPT-5.2 Chat

GPT-5.1 vs GPT-5.2 Chat: side-by-side summary

GPT-5.1 and GPT-5.2 Chat are available through the OpenRouter API, so switching between them takes a model slug change rather than a new integration.

GPT-5.1, from OpenAI, has a 400,000-token context window and is priced at $1.25/M tokens input, $10/M tokens output on OpenRouter.

GPT-5.2 Chat, from OpenAI, has a 128,000-token context window and is priced at $1.75/M tokens input, $14/M tokens output on OpenRouter.

Context window

• GPT-5.1: 400,000 tokens
• GPT-5.2 Chat: 128,000 tokens

Price

• GPT-5.1: $1.25/M tokens input, $10/M tokens output
• GPT-5.2 Chat: $1.75/M tokens input, $14/M tokens output

Provided by

• GPT-5.1: OpenAI
• GPT-5.2 Chat: OpenAI

• GPT-5.1 model details, providers and pricing
• GPT-5.2 Chat model details, providers and pricing

GPT-5.1 vs GPT-5.2 Chat at a glance